All these files should be sourced, not executed; and Debian's lintian complains:
W: zsh-syntax-highlighting: script-not-executable usr/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
* highlighters/main/test-data/hashed-command.zsh:
Set the right region key. This makes the test more specific.
(Issue #184 would have caught this bug.)